Fractional Head of Growth: When and Why to Hire One

Not every company needs a CMO. Some need someone closer to the product, the data, and the experiments. That's a Head of Growth — and increasingly, companies are hiring them fractionally.

A fractional head of growth is a senior growth leader who works with your company part-time (typically 10-20 hours/week) to build and optimize your acquisition, activation, and retention engine. They're not a consultant who writes a deck and disappears — they embed with your team, own the metrics, and run the playbook.

What Does a Fractional Head of Growth Actually Do?

The head of growth role sits at the intersection of marketing, product, and data. Unlike a CMO (who tends to focus on brand, positioning, and team management), a head of growth is obsessed with the funnel.

A typical fractional head of growth engagement includes:

Growth Strategy & Experimentation

• Auditing your current acquisition channels and identifying the highest-leverage opportunities
• Building and prioritizing an experiment backlog (ICE or RICE scoring)
• Designing and running growth experiments across paid, organic, product, and lifecycle channels
• Setting up an experimentation cadence — weekly sprints with clear hypotheses, tests, and learnings

Analytics & Measurement

• Defining and tracking core growth metrics: CAC, LTV, activation rate, retention curves, payback period
• Building dashboards and attribution models
• Conducting cohort analysis and funnel optimization
• Presenting growth metrics to leadership and investors

Channel Operations

• Managing paid acquisition (Meta, Google, LinkedIn) — either directly or through agencies
• Optimizing SEO and content for organic growth
• Building lifecycle marketing flows (onboarding, retention, reactivation)
• Evaluating new channels: partnerships, referrals, PLG motions, community-led growth

Team & Vendor Management

• Hiring and managing growth marketers, contractors, and agencies
• Evaluating and implementing marketing tech stack
• Aligning growth efforts with product and sales teams

Fractional Head of Growth vs. Fractional CMO

These roles overlap, but they're different in focus and temperament:

In practice: if your company's challenge is "we need more customers, faster, and we need to figure out which channels work" — you want a head of growth. If it's "we need someone to build and lead our entire marketing function" — you want a CMO.

When Should You Hire a Fractional Head of Growth?

A fractional head of growth is the right move when:

• You've found product-market fit but haven't cracked scalable acquisition. You have customers, they love the product, but you're still relying on founder-led sales or word of mouth.
• You're spending on ads but don't know what's working. You have budget in Meta or Google but no clear attribution, no experimentation process, and no one optimizing systematically.
• You're Series A or B and need to prove growth metrics to investors. Investors want to see efficient CAC, improving retention, and a repeatable growth engine. A fractional head of growth builds exactly this.
• You can't justify (or find) a $250K+ full-time hire. Senior heads of growth at top startups command $200-300K+ total comp. A fractional engagement gets you the same caliber at $8,000-$15,000/month.
• You need speed. A full-time search takes 3-6 months. A fractional head of growth can start in 1-2 weeks and begin running experiments immediately.

What Results Should You Expect?

In the first 90 days of a fractional head of growth engagement, you should see:

Month 1: Audit & Foundation

• Full-funnel audit of current growth channels, metrics, and attribution
• Identification of top 3-5 growth levers
• Analytics setup or cleanup (tracking, dashboards, attribution)
• Initial experiment backlog created

Month 2: Test & Learn

• First experiments launched across highest-potential channels
• Baseline metrics established: CAC, conversion rates, retention by cohort
• Quick wins identified and captured
• Growth process established (weekly sprints, experiment tracking)

Month 3: Scale What Works

• Winning experiments scaled with increased budget
• Losing channels deprioritized or paused
• Clear picture of unit economics and channel efficiency
• Hiring plan for full-time growth team if needed

How Much Does a Fractional Head of Growth Cost?

Most fractional head of growth engagements fall in the $8,000 - $15,000/month range for 10-20 hours per week. Factors that influence cost:

• Experience level: A former VP of Growth from a unicorn costs more than a senior growth marketer stepping into their first leadership role
• Scope: Strategy + hands-on execution costs more than strategy-only
• Industry: E-commerce and SaaS are well-understood; more niche industries may command a premium
• Time commitment: 10 hours/week is the minimum for meaningful impact; 15-20 hours is ideal for an active growth program

For a full pricing breakdown across all fractional marketing roles, see our Fractional CMO Cost Guide.

How to Hire the Right Fractional Head of Growth

Look for these qualities:

1. T-shaped skills: Deep expertise in 1-2 channels (e.g., paid acquisition, SEO, PLG) with broad understanding across the full funnel
2. Data fluency: They should be comfortable in analytics tools, spreadsheets, and SQL — not just "data-informed" but data-native
3. Experimentation mindset: Ask about their experiment process. If they can't articulate a structured approach to hypothesis → test → learn → iterate, keep looking
4. Stage-appropriate experience: Growth at a Series A SaaS is completely different from growth at a DTC brand. Look for relevant stage and industry experience
5. Execution speed: The best growth leaders ship fast. Ask about turnaround times and velocity of experiments in past roles